FU
Fixture unit calculator
Count lavs, closets, sinks, and showers → total water supply and drainage fixture units, plus service-size guidance.
Tools & demos
Free plumbing tools — the demo versions.
Real math, real renderer, capped on purpose. These are demos of what runs inside NectARM — the public code tables, not the shop's full calculator stack. The full versions size branches, feed the drawing, and link to your stock; those live inside the product.
¼″
Drain slope calculator
Run length and pipe size in → required fall out. The quarter-inch-per-foot rule and where it changes.
Ø
Pipe size calculator
Fixture units in → service and main size class out, from published sizing tables.
3D
3D house walk
Walk a sample whole-home plumbing drawing in 3D — the real renderer, fixed sample house.
◎
Service-area demo
Sample zones, sample jobs — watch how drive time and zone rules rank the next opening.
→
The full product
Sizing that feeds the drawing, stock-linked takeoffs, and your real zones. That's the walkthrough.
Why the limits
Demos show the math. The product does the workflow.
Each tool runs a few free calculations a day and returns the headline answer. Inside NectARM the same math sizes branches, feeds isometric drawings, links to shop stock, and remembers everything on the job. That's the part we don't give away — it's the product.